Rotary automatic control means



June 1931. J. J. MCGERRY ET AL 1,308,901

ROTARY AUTOMATIC CONTROL MEANS Filed Aug. 4. 1930 2 Sheets-Sheet 1 ATTORNEY! '.June 9, 1931. J. J. MQGERRY ET AL, 3 9

ROTARY AUTOMATIC CONTROL MEANS Filed A145, 4, ;,'19s0 Z SheetS-Sheet 2 dam clM qel-r Char hill/milk;

W r6! ATTORNEYS Patented June 9, 1931 UNITED STATES PATENT OFFICE JAMES J. MoGER-RY, OF CHICAGO, ILLINOIS, Ann qnanLns 3. F Kanamnzeo, MICHIGAN, AssIeNons T0 ROTARY UTILITY oonronerio gr, or or roneo, ILLINOIS.

ROTARY AUTOMATIC oo g'rnon Application filed August 4, 1930. Serial No. 478,106,

The objects of the invention are:

First, to provide an improved reciprocating cam for controlling automatically arotary or revolving device, such as a revolving chair or revolving door or gate, or a self-closing door or gate.

Second, to provide an improved concentrically constructed device of the kind.

Third, to provide improved casing or housing means for such a structure.

Objects pertaining to details and economies of construction will appear from the description to follow. A preferred embodiment of our invention is illustrated in the accompanying drawings, in which:

Fig. 1 is a detail elevation view of our improved structure as it appears when incorporated into the pedestal of a revolving chair, a fragment of such a chair being shown diagrammatically.

Fig. 2 is an enlarged detail vertical central sectional elevation taken on section line 22 of Fig. 1, the central shaft and cam u roller being shown in full lines. Fig. 3 is an enlarged detail transverse sectional plan view taken on line 33 of Fig. 2.

Fig. 4 is an elevation of the cam, detached, taken from the left hand of Fig. 2.

Fig. 5 is a diagrammatic development of the said cam.

Fig. 6 is an enlarged detail vertical sectional view of a modification or species, the view corresponding to the view as seen in Fig. 2 and being taken on line 66 of Figs. 7

and 8.

Fig. 7 is a detail transverse sectional view on the irregular line 7-7 of Fig. 6.

Fig. 8 is an enlarged detail sectional View on line 88 of Fig. 6.

Fig. 9 is a detail of the thrust bearing button disposed in the bottom of the casing to carry the revolving shaft.

The parts will be identified by their numerals of reference which are the same in all the views.

1 is the upper end of a suitable pedestal shown here formed of sheet metal. 2 is the revolving shaft spindle which supportsthe so chair or other revolvlng structure. 3 1s a diagrammatic view of a fragment of a re-.

volving chair, or it mightbe a revolving dooror a self-closing door or gate.

4 is the'outer shell or housing of our improved control mechanism. This is a sheet. metal drum having a head 41 journaled at the center for the revolving shaft, 2. This head 41 is retained by inwa dly struck lugs, or fingers 42, see Fig. 2.

The. casing is provided with a bottom 43, which, in the preferred construction in Fig. 2 is shown retained in positionby the inwardly spun loweredge 4a of the casing. A vertical guide rib. 4:5.- is struck at one side to, engage and guide the reciprocating cam. A

thrust hearing member 5 is provided or th lower end of. the shaft 2. .A. thrust col ar 6. 1s. provided on the shaft retained by pin disposed to engage the bearing surface n th under side of the. head 41,. The'head i1 is.

pr vided with a downwardly pr j ting huh L ing rib. engaging the ve tical s i e g ov 71.. The upper end on": the c m is pr id d with a projecti g hub 72. Th wn is u ged downwardly by the coiled spring 73 which surrounds the shaft 2, engages the hub part 41 on th under side of the head 4:1, and the hub 72 on. the top of the cam 7, The em roller 8 is suppo ed on a su ta l c s pin 81 is the. ower pa t; of the shaft It will thus be seen that wh n the sha 2 is rotated to ne side or the other, he am roller 8 will. react upon he cam 7 nd ca s the same. to he raise agai st t e hrust. of the spring 73.. Wheneverthe ha o other revolving part is released, the spring 73 forces the cam down which r acts aga the roller 8 and returns the'shaft to the central or initial position.

The shaft is thus free to revolve, but whenever the parts are released they return automatically to the normal position.

Figs. 6, 7 and 8 show modifications. I have I added a cap 9 that embraces the upper end of the pedestal part being retained in place by screws 91. The cam 10 corresponds to cam 7. This cam however revolves with the shaft 2 and the shaft contains a vertical groove 21 which is engaged by guide pin 101 carried by the cam, see Fig. 7. A cam roller 11 is supported on a suitable pin 12 which is secured to the casing 4. The casing bottom 13 In this modified structure it willbe noted that as the cam revolves with the shaft 2, it will be reciprocated up and down by its reaction against the cam roller and while the parts can revolve whenever they are released,

the cam acting against the roller will return the same to the normal position. 7

This structure provides a large space for a heavy coiled spring and makes a device capable of handling heavy revolving doors or swinging doors, gates, or any heavy revolving or pivoted structure requiring control.

Having thus described our invention what we claim as new and desire to secure by Let-- ters Patent is:

1. The combination of a revoluble support ing shaft, a casing having a head journaled on the said shaft and having a thrust bearing therefor, a stop collar on the said shaft within the casing, a face cam adapted to reciprocate within said casing on the said shaft, guide means therefor, a coiled spring surrounding the said shaft and disposed between the head of the casing and the said cam, and a cam roller supported on a cam pin transversely through the said shaft, whereby the shaft is free to revolve and yet will be returned to normal position when released by the reaction of the cam.

2. In a structure of the class described, the combination of a revoluble shaft, a casing journaled thereon having suitable thrust bearing, a sliding cam guided on the said shaft having a spring for actuating the same, and a cam roller carried on said casing co-" operating with said cam to return the said shaft to normal position.

3. In a structure of the class described, the combination of a revoluble shaft, a casin having a head journaled on said shaft and having a suitable thrust bearing, a sliding cam on the said shaft, a spring for actuating the same and a cooperating cam roller, one of which is secured to the said shaft and the other of which is secured to the said casing.

In witness whereof we have hereunto set our hands.

JAMES J. MOGERRY. CHARLES H. WRITING.

is here secured by inwardly spun depression 

